Question

Notify Me Bookmark

For the amplifier network shown in the figure, neglect the re value, the input voltage has an amplitude of 1 V and frequency 1 kHz, the amplifier gain is

For the amplifier network shown in the figure, neglect the re value, the input voltage has an amplitude of 1 V and frequency 1 kHz, the amplifier gain is

Image text
For the amplifier network shown in the figure, neglect the r e value, the input voltage has an amplitude of 1 V and frequency 1 k H z , the amplifier gain is

Detailed Answer

0 0

Please enter your email here. You will get email when this question is answered by our tutor.

Doubtrix Logo

Problem is not yet solved!

Click on Notify me to get email when question is answered.

Join Doubtrix with 7-days free trial

  • Icon Correct & Verified Answers
  • Icon No AI-Generated Answers
  • Icon Video Solution for Difficult Questions
  • Icon Work With Experts to Reach at Correct Answers
Notify me Login Sign Up

Similar/Related Questions

An NMOS amplifier is shown in Figure 1. Transistor M1 is biased in the saturation region for an amplifier application. The circuit is biased with a resistive voltage divider consisting of R1 and R2, a source degeneration resistor RS, and a load resistor RD. The drain bias current for the design is ID = 500 μA and VDS is 1.625 V. The device parameters are: L = 0.5 μm, W = 10 μm, kn’ = 200 μA/V2, Vtn = 0.5 V, and λn = 0. analyze the frequency response of the amplifier. a) Draw a midband small signal ac equivalent circuit model for the amplifier. For midband you can assume the reactance of Cin is sufficiently low that it is a short circuit. b) Derive an expression for the midband voltage gain transfer function Vout /Vsig. The amplified output signal is taken from the drain terminal and Vout = Vd. Write your gain function in terms of variables only. c) Evaluate the midband gain and calculate a value both in V/V and dB. d) Analyze the frequency response of the input network including the capacitor Cin. Find an expression for the transfer function H1(jω) = Vg/Vsig. e) Evaluate H1(jω) = Vg/Vsig and make a Bode plot of the magnitude of H1(jω). The x-axis is ω (log scale) and the y-axis is the magnitude in dB. f) Use the LTSPICE circuit template and verify the frequency response of the amplifier circuit. Include a copy of the schematic and the frequency response plot. Use 20 points per decade and a frequency span of 0.1 Hz to 100 Hz.
Solution
0 0

Assume that the MOSFET has the following parameters: Vt = 1 V, K = 0.4 mA/V2 VA = 40 V. It is connected as an amplifier as shown in Figure Q4 and vs is an AC input voltage and vo is the AC output voltage. The DC drain voltage VD is set to be 0 V. Further assume that all the capacitors in the circuit are very large. Figure Q7. (a) Which type of amplifier configuration does the above circuit (3 marks) belong to? What are the electrical properties of this type of amplifier configuration? (b) Show that the MOS transistor operates in the saturation mode. (3 marks) State one electrical characteristic of a saturated MOS transistor. (c) Determine the drain current ID. (10 marks) (d) Design the load resistance RL such that the AC voltage gain vo/vs of (10 marks) the MOSFET amplifier equals -10 . (e) Suppose the amplitude of AC input vs is 0.2 V and the AC voltage (4 marks) gain of the amplifier equals -10. Do we have a distorted AC output waveform?

Solution
0 0

For this problem, neglect capacitances and ro in transistors and use long-channel equations. M1 is operated with Vov = 0.6 V. The amplifier is intended to be used with a source resistance RS = 50 Ω. (a) Calculate (W/L)1 for an input impedance equal to 50 Ω. What is the required ID1? (b) If (W/L)2 = (W/L)3 what is the required value if I bias ? (c) Calculate R for a voltage gain vo/vi = 10 (d) Symbolically, calculate the NF considering the contribution of M1, M2 and R. (e) To reduce noise figure, is it better to use a high or a low overdrive in M2 and M3? Explain why. (f) If |Vov2| = 1 V, calculate (W/L)2, the DC component at vo and F in dB. CMOS process data: VDD = 1.8 V. For NMOS, Vthn = 0.4 V, μn = 400 cm2/Vs, Cox = 9 fF/μm2 and γn = 1. The parameters for PMOS transistors are k′ = μpCox = 90 μA/V2, Vthp = −0.4 V and γp = 0.8.
Solution
0 0